setValue() should not be able to 'let' aka set new vars
setValue() should not be able to 'let' aka set new vars

to ensure it's still possible to create new vars via the Runtime API, there's a new Let() method (which might shadow a var existing in a parent scope), as well as SetOrLet() which does the right thing for you, depending on if a var with the given name exists or not.

CloudyKit/jet,CloudyKit/jet,CloudyKit/jet